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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtSerialBus module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
#include "qmodbusrtuserialmaster.h"
#include "qmodbusrtuserialmaster_p.h"
#include <QtCore/qloggingcategory.h>
QT_BEGIN_NAMESPACE
Q_DECLARE_LOGGING_CATEGORY(QT_MODBUS)
Q_DECLARE_LOGGING_CATEGORY(QT_MODBUS_LOW)
/*!
\class QModbusRtuSerialMaster
\inmodule QtSerialBus
\since 5.8
\brief The QModbusRtuSerialMaster class represents a Modbus client
that uses a serial bus for its communication with the Modbus server.
Communication via Modbus requires the interaction between a single
Modbus client instance and multiple Modbus servers. This class
provides the client implementation via a serial port.
*/
/*!
Constructs a serial Modbus master with the specified \a parent.
*/
QModbusRtuSerialMaster::QModbusRtuSerialMaster(QObject *parent)
: QModbusClient(*new QModbusRtuSerialMasterPrivate, parent)
{
Q_D(QModbusRtuSerialMaster);
d->setupSerialPort();
}
/*!
\internal
*/
QModbusRtuSerialMaster::~QModbusRtuSerialMaster()
{
close();
}
/*!
Returns the amount of microseconds for the silent interval between two
consecutive Modbus messages.
\sa setInterFrameDelay()
*/
int QModbusRtuSerialMaster::interFrameDelay() const
{
Q_D(const QModbusRtuSerialMaster);
return d->m_interFrameDelayMilliseconds * 1000;
}
/*!
Sets the amount of \a microseconds for the silent interval between two
consecutive Modbus messages. By default, the class implementation will use
a pre-calculated value according to the Modbus specification. A active or
running connection is not affected by such delay changes.
\note If \a microseconds is set to -1 or \a microseconds is less than the
pre-calculated delay then this pre-calculated value is used as frame delay.
*/
void QModbusRtuSerialMaster::setInterFrameDelay(int microseconds)
{
Q_D(QModbusRtuSerialMaster);
d->m_interFrameDelayMilliseconds = qCeil(qreal(microseconds) / 1000.);
d->calculateInterFrameDelay();
}
/*!
\since 5.13
Returns the amount of milliseconds for the silent interval between a Modbus
broadcast and a consecutive Modbus messages. The default value is set to
\c 100 milliseconds.
*/
int QModbusRtuSerialMaster::turnaroundDelay() const
{
Q_D(const QModbusRtuSerialMaster);
return d->m_turnaroundDelay;
}
/*!
\since 5.13
Sets the amount of milliseconds for the silent interval between a Modbus
broadcast and a consecutive Modbus messages to \a turnaroundDelay.
Typically the turnaround delay is in the range of \c 100 to \c 200
milliseconds.
*/
void QModbusRtuSerialMaster::setTurnaroundDelay(int turnaroundDelay)
{
Q_D(QModbusRtuSerialMaster);
d->m_turnaroundDelay = turnaroundDelay;
}
/*!
\internal
*/
QModbusRtuSerialMaster::QModbusRtuSerialMaster(QModbusRtuSerialMasterPrivate &dd, QObject *parent)
: QModbusClient(dd, parent)
{
Q_D(QModbusRtuSerialMaster);
d->setupSerialPort();
}
/*!
\reimp
\note When calling this function, existing buffered data is removed from
the serial port.
*/
bool QModbusRtuSerialMaster::open()
{
if (state() == QModbusDevice::ConnectedState)
return true;
Q_D(QModbusRtuSerialMaster);
d->setupEnvironment(); // to be done before open
if (d->m_serialPort->open(QIODevice::ReadWrite)) {
setState(QModbusDevice::ConnectedState);
d->m_serialPort->clear(); // only possible after open
} else {
setError(d->m_serialPort->errorString(), QModbusDevice::ConnectionError);
}
return (state() == QModbusDevice::ConnectedState);
}
/*!
\reimp
*/
void QModbusRtuSerialMaster::close()
{
if (state() == QModbusDevice::UnconnectedState)
return;
setState(QModbusDevice::ClosingState);
Q_D(QModbusRtuSerialMaster);
if (d->m_serialPort->isOpen())
d->m_serialPort->close();
int numberOfAborts = 0;
while (!d->m_queue.isEmpty()) {
// Finish each open reply and forget them
QModbusRtuSerialMasterPrivate::QueueElement elem = d->m_queue.dequeue();
if (!elem.reply.isNull()) {
elem.reply->setError(QModbusDevice::ReplyAbortedError,
QModbusClient::tr("Reply aborted due to connection closure."));
numberOfAborts++;
}
}
if (numberOfAborts > 0)
qCDebug(QT_MODBUS_LOW) << "(RTU client) Aborted replies:" << numberOfAborts;
setState(QModbusDevice::UnconnectedState);
}
QT_END_NAMESPACE
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